Daniel Ancuta introduces a Python tool using geospatial queries with Couchbase REST API and Couchbase Full Text Search to search a database of cities. The tool allows users to load data from a CSV file, insert it into a Couchbase bucket, and perform searches by name, coordinates, or distance. The code is written in Python 3.6.4 and uses Couchbase Enterprise Edition 5.1.0 build 5552. It covers the basics of geospatial queries, Couchbase setup, data loading, and search functionality. The tool provides a basic framework for more advanced applications, such as serving data through a CLI or REST API, improving data loading performance, and exploring other features like faceting and sorting.